.main {
    width: 100%;
    margin: 0 auto;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
}

.main .title-box {
    width: 100%;
    height: 182px;
    margin-bottom: 33px;
    background-color: #d62300;
}

.main .title-box .title-banner {
    width: 1180px;
    height: 182px;
    margin: 0 auto;
    background-repeat: no-repeat;
    background-position: center center;
}

/* 导航栏 */
.main .title-nav {
    width: 100%;
    margin: 0 auto;
}

/* 一级导航栏 */
.main .title-nav .top-nav-box {
    margin: 0 auto;
}
.top-nav-box ul.top-nav {
    height: 60px;
    display: flex;
    justify-content: center;
    position: relative;
}

.top-nav-box ul.top-nav li {
    height: 60px;
    line-height: 60px;
    margin: 0 7px;
    padding: 0 35px;
    border-radius: 15px;
    font-size: 28px;
    text-align: center;
    background: white;
    cursor: pointer;
}

.top-nav-box ul.top-nav li.active:nth-child(1)::after {
    width: 0;
    height: 0;
    border: 15px solid transparent;
    border-bottom-color: white;
    bottom: -20px;
    left: 385px;
    content: "";
    display: block;
    z-index: 1000;
    position: absolute;
}

.top-nav-box ul.top-nav li.active {
    background: #d62300;
}

.top-nav-box ul.top-nav li.active a {
    color: white;
}

/* 主要内容 */
.main .main-content {
    padding-top: 80px;
    box-sizing: border-box;
}

.main .main-content .img-item1 {
    width: 100%;
    height: 590px;
    border-radius: 20px;
    margin: 0 auto;
    margin-bottom: 36px;
    padding: 50px 50px;
    box-sizing: border-box;
    box-shadow: 0 0 18px 5px rgba(0, 0, 0, 0.09);
    display: flex;
    justify-content: center;
    align-items: center;
}

.main .main-content .img-item1 img {
    width: 80%;
}

.main .main-content .img-item2 {
    width: 100%;
}

.main .main-content .img-item2 img {
    margin: 0 190px;
}